TSI Instruments DustTrak 8540, Operation And Service Manual

Page: 40 / 78

Chapter 4 30
NOTES
•
If you installed a gravimetric filter into the DustTrak
™
monitor and are; therefore, using the DustTrak
™
monitor
to obtain a gravimetric sample, the flow rate used to
compute the concentration should be 2 L/min, not 3 L/min
since only 2 L/min of aerosol flow reaches the filter.
•
To ensure proper fit into the DustTrak
™
gravimetric holder,
TSI
®
recommends using conductive, polypropylene,
2-piece 37-mm cassette housings.
9. Compute the new calibration constant, NewCal, using the
following formula:
NewCal=
(
Reference Concentration
DustTrak Concentration
)
∙CurrentCal
10. Enter the new value into one of
the custom user cals and turn that
cal “on” using the radio button.
Starting a DustTrak
™
Sample Run
Once a log mode is set and a calibration mode selected, the
DustTrak
™ monitor can be started using TrakPro™ software. To start
a sample, perform the following steps.
First select Logging Control
Select Instrument Setup ->
Logging Control .